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- ±20 V isolated voltage source
- Ultra-low noise output
- Two switchable, recharging batteries for continuous operation
- Battery lifetime: 1000 charge cycles
- Output floats to ±40 V
- Short-circuit protected
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The SIM928 Isolated Voltage Source is ideal for applications where
ultra-clean DC voltage is required. Voltage can be set between ±20
VDC with millivolt resolution, and the source can drive up to ±10
mA. The output circuit is optically isolated from all earth-referenced
charging circuitry, providing maximum flexibility and noise immunity.
The system can float to ±40 V, and the output is short-circuit
protected.
At the heart of the SIM928 are two independent nickel-metal-hydride
rechargeable batteries, each providing up to 12 hours of operation
under full
load conditions. When a battery is nearly depleted,
the SIM928 automatically switches in a second battery. The switchover
between batteries is virtually glitch-free, giving you uninterrupted
power around the clock. The depleted battery is automatically charged
to capacity in about 5 hours. The batteries are guaranteed for 1000
charging cycles, and SRS offers replacement battery sets.
In applications that occur over long time intervals, starting with
a fully charged battery may be desirable. A battery charge override
feature allows you to manually switch in the fully charged battery
(assuming it is in “ready” state) at any time.
Banana binding posts are provided for the + terminal, - terminal
and chassis ground.
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Specifications |
| Output |
| Output range |
±20 V, 1 mV resolution |
| Max. output current |
±10 mA |
| Floating output |
±40 V (common mode to ground) |
| Noise |
10 µVrms (1 kHz bandwidth) |
| Current limit |
15 mA |
| Short-circuit duration |
indefinite |
| Batteries |
| Number of batteries |
2 (1 operating, 1 charging/standby) |
| Type |
Nickel metal hydride |
| Charge time |
5 hrs. |
| Discharge time |
12 hrs. (10 mA load) |
| Lifetime |
>1000 charge cycles, 2 yr. shelf life |
| Battery switching |
Automatically switches batteries when active battery is
fully discharged. |
| Switchover glitch |
<1 mV for <1 ms |
| Battery charge override |
Allows manual switching of batteries. Triggered when front-panel
button is held for 5 seconds or more. Only armed when standby battery
is in ready state. |
| General |
| Operating temperature |
0 °C to 40 °C, non-condensing |
| Interface |
Serial via SIM interface |
| Connectors |
Banana binding posts (+ terminal, - terminal, and chassis
ground) DB15 (male) SIM interface |
| Power |
Power supplied by the SIM900 Mainframe, or optionally
by a user-provided DC power supply (-15 V, +24 V and +5 V) |
| Dimensions |
1.5" × 3.6" × 7.0" (WHL) |
| Weight |
3 lbs. |
| Warranty |
One year parts and labor on defects in materials and workmanship |
Stanford Research Systems, Inc. • 1290-D
Reamwood Ave., Sunnyvale, CA 94089
Phone: (408) 744-9040 • Fax: (408) 744-9049 • email: info@thinkSRS.com
• www.thinkSRS.com
© Stanford Research Systems, Inc. 2003
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